v17.2.7 Quincy released

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


We're happy to announce the 7th backport release in the Quincy series.


Notable Changes

* `ceph mgr dump` command now displays the name of the Manager module that
  registered a RADOS client in the `name` field added to elements of the
  `active_clients` array. Previously, only the address of a module's RADOS
  client was shown in the `active_clients` array.

* mClock Scheduler: The mClock scheduler (default scheduler in Quincy) has
  undergone significant usability and design improvements to address the slow
  backfill issue. Some important changes are:

  * The 'balanced' profile is set as the default mClock profile because it
    represents a compromise between prioritizing client IO or recovery IO. Users
    can then choose either the 'high_client_ops' profile to prioritize client IO
    or the 'high_recovery_ops' profile to prioritize recovery IO.

  * QoS parameters including reservation and limit are now specified in terms
    of a fraction (range: 0.0 to 1.0) of the OSD's IOPS capacity.

  * The cost parameters (osd_mclock_cost_per_io_usec_* and
    osd_mclock_cost_per_byte_usec_*) have been removed. The cost of an operation
    is now determined using the random IOPS and maximum sequential bandwidth
    capability of the OSD's underlying device.

  * Degraded object recovery is given higher priority when compared to misplaced
    object recovery because degraded objects present a data safety issue not
    present with objects that are merely misplaced. Therefore, backfilling
    operations with the 'balanced' and 'high_client_ops' mClock profiles may
    progress slower than what was seen with the 'WeightedPriorityQueue' (WPQ)

  * The QoS allocations in all mClock profiles are optimized based on the above
    fixes and enhancements.

  * For more detailed information see:

* RGW: S3 multipart uploads using Server-Side Encryption now replicate
  correctly in multi-site. Previously, the replicas of such objects were
  corrupted on decryption.  A new tool, ``radosgw-admin bucket resync encrypted
  multipart``, can be used to identify these original multipart uploads. The
  ``LastModified`` timestamp of any identified object is incremented by 1
  nanosecond to cause peer zones to replicate it again.  For multi-site
  deployments that make any use of Server-Side Encryption, we recommended
  running this command against every bucket in every zone after all zones have

* CephFS: MDS evicts clients which are not advancing their request tids which
  causes a large buildup of session metadata resulting in the MDS going
  read-only due to the RADOS operation exceeding the size threshold.
  `mds_session_metadata_threshold` config controls the maximum size that a
  (encoded) session metadata can grow.

* CephFS: After recovering a Ceph File System post following the disaster
  recovery procedure, the recovered files under `lost+found` directory can now
  be deleted.

Getting Ceph
* Git at git://github.com/ceph/ceph.git
* Tarball at https://download.ceph.com/tarballs/ceph-17.2.7.tar.gz
* Containers at https://quay.io/repository/ceph/ceph
* For packages, see https://docs.ceph.com/en/latest/install/get-packages/
* Release git sha1: b12291d110049b2f35e32e0de30d70e9a4c060d2
ceph-users mailing list -- ceph-users@xxxxxxx
To unsubscribe send an email to ceph-users-leave@xxxxxxx

[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Ceph Dev]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]

  Powered by Linux